In the steady state, cardiac output equals. venous return. Factors that cause hypereffective heart. Sympathetic stimulation can increase the effectiveness of the heart via: (2) increasing the strength of heart contraction. Factors that can cause a hypoeffective heart: (1) coronary artery blockage.
Thursday, March 19, 2015 - 11:09. Ed Sheeran has added yet another amazing accolade to his collection with the news that his global smash hit sophomore album X has hit the 2 million sales mark, joining a select band of chosen superstars to hit the same achievement.
Barbadian singer Rihanna has released eight studio albums, two compilation albums, two remix albums, one reissue, and 58 singles (including thirteen as a featured artist). Since the beginning of her career in 2005, Rihanna has sold over 200 million records, making her one of the best-selling artists of all time.